The 2008 Nura Mw6.7 earthquake: A shallow rupture on the Main Pamir Thrust revealed by GPS and InSAR
The 2008 Nura Mw6.7 earthquake: A shallow rupture on the Main Pamir Thrust revealed by GPS and InSAR
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DOI：
10.1016/j.geog.2015.01.005
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发表时间：
2015-03
影响因子：
2.4
通讯作者：
X. Qiao;Qi Wang;Shaomin Yang;Jie Li;Rong Zou;K. Ding
中科院分区：
文献类型：
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作者：
X. Qiao;Qi Wang;Shaomin Yang;Jie Li;Rong Zou;K. Ding
2008年的NuraMw6.7级地震发生在中亚的Trans-Alai山脉前。我们提出了干涉合成孔径雷达（InSAR）测量其同震地面变形，可用于该地区的一次大地震。对InSAR数据的分析表明，地震使帕米尔主逆冲断层的次级断层破裂约20公里。走向N46°E、倾角48°SE的断裂面以3 m的逆冲滑动为主，主要局限于地壳最上层2 ~ 5 km，与1974Mw7.0 markanssu地震相似。受GPS测量约束的地震间形变弹性模型表明，这两次地震可能是由于两个高角度逆断层的断裂造成的，这两个断层相距约10公里，根植于5-6公里深的一个锁定的地层中。弹性应变是由一个自由爬行的直径约为16mm /a的轴体建立的。
The 2008 NuraMw6.7 earthquake occurred in front of the Trans-Alai Range, central Asia. We present Interferometric Synthetic Aperture Radar (InSAR) measurements of its coseismic ground deformation that are available for a major earthquake in the region. Analysis of the InSAR data shows that the earthquake ruptured a secondary fault of the Main Pamir Thrust for about 20 km. The fault plane striking N46°E and dipping 48°SE is dominated by thrust slip up to 3 m, most of which is confined to the uppermost 2–5 km of the crust, similar to the nearby 1974Mw7.0 Markansu earthquake. The elastic model of interseismic deformation constrained by GPS measurements suggests that the two earthquakes may have resulted from the failures of two high-angle reverse faults that are about 10 km apart and rooted in a locked décollement at depths of 5–6 km. The elastic strain is built up by a freely creeping décollement at about 16 mm/a.